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osmo-pcu/src/gprs_rlcmac.cpp

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/* gprs_rlcmac.cpp
*
* Copyright (C) 2012 Ivan Klyuchnikov
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <gprs_bssgp_pcu.h>
#include <pcu_l1_if.h>
#include <gprs_rlcmac.h>
#include <gsmL1prim.h>
LLIST_HEAD(gprs_rlcmac_tbfs);
void *rlcmac_tall_ctx;
LLIST_HEAD(block_queue);
int tfi_alloc()
{
struct gprs_rlcmac_tbf *tbf;
uint32_t tfi_map = 0;
uint32_t tfi_ind = 0;
uint32_t mask = 1;
uint8_t i;
llist_for_each_entry(tbf, &gprs_rlcmac_tbfs, list) {
tfi_ind = 1 << tbf->tfi;
tfi_map = tfi_map|tfi_ind;
}
for (i = 0; i < 32; i++) {
if(((tfi_map >> i) & mask) == 0) {
return i;
}
}
return -1;
}
/* lookup TBF Entity (by TFI) */
static struct gprs_rlcmac_tbf *tbf_by_tfi(uint8_t tfi, gprs_rlcmac_tbf_direction dir)
{
struct gprs_rlcmac_tbf *tbf;
llist_for_each_entry(tbf, &gprs_rlcmac_tbfs, list) {
if ((tbf->tfi == tfi)&&(tbf->direction == dir))
return tbf;
}
return NULL;
}
static struct gprs_rlcmac_tbf *tbf_by_tlli(uint32_t tlli, gprs_rlcmac_tbf_direction dir)
{
struct gprs_rlcmac_tbf *tbf;
llist_for_each_entry(tbf, &gprs_rlcmac_tbfs, list) {
if ((tbf->tlli == tlli)&&(tbf->direction == dir))
return tbf;
}
return NULL;
}
static void tbf_free(struct gprs_rlcmac_tbf *tbf)
{
llist_del(&tbf->list);
talloc_free(tbf);
}
/* Lookup LLC PDU in TBF list of LLC PDUs by number. */
static struct tbf_llc_pdu *tbf_llc_pdu_by_num(struct llist_head llc_pdus, uint8_t num)
{
struct tbf_llc_pdu *llc_pdu;
llist_for_each_entry(llc_pdu, &llc_pdus, list) {
if (llc_pdu->num == num)
return llc_pdu;
}
return NULL;
}
/* Add new LLC PDU to the TBF list of LLC PDUs. */
int tbf_add_llc_pdu(struct gprs_rlcmac_tbf *tbf, uint8_t *data, uint16_t llc_pdu_len)
{
struct tbf_llc_pdu *llc_pdu;
llc_pdu = talloc_zero(rlcmac_tall_ctx, struct tbf_llc_pdu);
if (!llc_pdu)
return 0;
llc_pdu->num = tbf->llc_pdu_list_len;
llc_pdu->len = llc_pdu_len;
LOGP(DBSSGP, LOGL_NOTICE, "LLC PDU = ");
for (unsigned i = 0; i < llc_pdu_len; i++)
{
llc_pdu->data[i] = data[i];
LOGPC(DBSSGP, LOGL_NOTICE, "%02x", llc_pdu->data[i]);
}
LOGPC(DBSSGP, LOGL_NOTICE, "\n");
llist_add(&llc_pdu->list, &tbf->llc_pdus);
tbf->llc_pdu_list_len++;
return 1;
}
struct gprs_rlcmac_tbf *tbf_alloc(gprs_rlcmac_tbf_direction dir, uint32_t tlli)
{
struct gprs_rlcmac_tbf *exist_tbf;
struct gprs_rlcmac_tbf *tbf;
uint8_t tfi;
uint8_t trx, ts;
// Downlink TDF allocation
if (dir == GPRS_RLCMAC_DL_TBF)
{
// Try to find already exist DL TBF
exist_tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_DL_TBF);
if (exist_tbf)
{
// if DL TBF is in establish or data transfer state,
// send additional LLC PDU during current DL TBF.
if (exist_tbf->stage != TBF_RELEASE)
{
if (exist_tbf->state != FINISH_DATA_TRANSFER)
{
return exist_tbf;
}
}
}
//Try to find already exist UL TBF
exist_tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_UL_TBF);
if (exist_tbf)
{
// if UL TBF is in data transfer state,
// establish new DL TBF during current UL TBF.
if (exist_tbf->stage == TBF_DATA_TRANSFER && !(exist_tbf->next_tbf))
{
tbf = talloc_zero(rlcmac_tall_ctx, struct gprs_rlcmac_tbf);
if (tbf)
{
// Create new TBF
tfi = tfi_alloc();
if (tfi < 0) {
return NULL;
}
/* FIXME: select right TRX/TS */
if (select_pdch(&trx, &ts)) {
LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n");
/* FIXME: send reject */
return NULL;
}
tbf->tfi = tfi;
tbf->trx = trx;
tbf->ts = ts;
tbf->arfcn = pcu_l1if_bts.trx[trx].arfcn;
tbf->tsc = pcu_l1if_bts.trx[trx].ts[ts].tsc;
tbf->llc_pdus = LLIST_HEAD_INIT(tbf->llc_pdus);
tbf->llc_pdu_list_len = 0;
tbf->direction = GPRS_RLCMAC_DL_TBF;
tbf->stage = TBF_ESTABLISH;
tbf->state = WAIT_ESTABLISH;
tbf->tlli = tlli;
llist_add(&tbf->list, &gprs_rlcmac_tbfs);
exist_tbf->next_tbf = tbf;
return tbf;
}
else
{
return NULL;
}
}
}
// No UL and DL TBFs for current TLLI are found.
if (!exist_tbf)
{
tbf = talloc_zero(rlcmac_tall_ctx, struct gprs_rlcmac_tbf);
if (tbf)
{
// Create new TBF
tfi = tfi_alloc();
if (tfi < 0) {
return NULL;
}
/* FIXME: select right TRX/TS */
if (select_pdch(&trx, &ts)) {
LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n");
/* FIXME: send reject */
return NULL;
}
tbf->tfi = tfi;
tbf->trx = trx;
tbf->ts = ts;
tbf->arfcn = pcu_l1if_bts.trx[trx].arfcn;
tbf->tsc = pcu_l1if_bts.trx[trx].ts[ts].tsc;
tbf->llc_pdus = LLIST_HEAD_INIT(tbf->llc_pdus);
tbf->llc_pdu_list_len = 0;
tbf->direction = GPRS_RLCMAC_DL_TBF;
tbf->stage = TBF_ESTABLISH;
tbf->state = CCCH_ESTABLISH;
tbf->tlli = tlli;
llist_add(&tbf->list, &gprs_rlcmac_tbfs);
return tbf;
}
else
{
return NULL;
}
}
}
else
{
// Uplink TBF allocation
tbf = talloc_zero(rlcmac_tall_ctx, struct gprs_rlcmac_tbf);
if (tbf)
{
// Create new TBF
tfi = tfi_alloc();
if (tfi < 0) {
return NULL;
}
if (select_pdch(&trx, &ts)) {
LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n");
/* FIXME: send reject */
return NULL;
}
tbf->tfi = tfi;
tbf->trx = trx;
tbf->ts = ts;
tbf->arfcn = pcu_l1if_bts.trx[trx].arfcn;
tbf->tsc = pcu_l1if_bts.trx[trx].ts[ts].tsc;
tbf->llc_pdus = LLIST_HEAD_INIT(tbf->llc_pdus);
tbf->llc_pdu_list_len = 0;
tbf->direction = GPRS_RLCMAC_UL_TBF;
tbf->stage = TBF_ESTABLISH;
tbf->state = WAIT_ESTABLISH;
tbf->next_tbf = NULL;
llist_add(&tbf->list, &gprs_rlcmac_tbfs);
return tbf;
}
else
{
return NULL;
}
}
}
/* Management of uplink TBF establishment. */
int tbf_ul_establish(struct gprs_rlcmac_tbf *tbf, uint8_t ra, uint32_t Fn, uint16_t qta)
{
if (tbf->direction != GPRS_RLCMAC_UL_TBF)
{
return -1;
}
if (tbf->stage == TBF_ESTABLISH)
{
switch (tbf->state) {
case WAIT_ESTABLISH:
{
if (qta < 0)
qta = 0;
if (qta > 252)
qta = 252;
tbf->ta = qta >> 2;
LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [UPLINK] START TFI: %u\n", tbf->tfi);
LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] TFI: %u RACH qbit-ta=%d ra=%d, Fn=%d (%d,%d,%d)\n",
tbf->tfi, qta, ra, Fn, (Fn / (26 * 51)) % 32, Fn % 51, Fn % 26);
LOGP(DRLCMAC, LOGL_NOTICE, "TX: [PCU -> BTS] TFI: %u Packet Immidiate Assignment\n", tbf->tfi);
bitvec *immediate_assignment = bitvec_alloc(23);
bitvec_unhex(immediate_assignment, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
int len = write_immediate_assignment(immediate_assignment, 0, ra, Fn, tbf->ta, tbf->arfcn, tbf->ts, tbf->tsc, tbf->tfi);
pcu_l1if_tx_agch(immediate_assignment, len);
bitvec_free(immediate_assignment);
tbf->state = FINISH_ESTABLISH;
}
break;
default:
LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [UPLINK] TFI: %u Unexpected TBF state = %u for stage = %u \n",
tbf->tfi, tbf->state, tbf->stage);
break;
}
}
else
{
return -1;
}
return 1;
}
/* Management of downlink TBF establishment. */
int tbf_dl_establish(struct gprs_rlcmac_tbf *tbf)
{
if (tbf->direction != GPRS_RLCMAC_DL_TBF)
{
return -1;
}
if (tbf->stage == TBF_ESTABLISH)
{
switch (tbf->state) {
case WAIT_ESTABLISH:
// Wait while UL TBF establishes DL TBF.
LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [DOWNLINK] TFI: Wait DL TBF establishment by UL TBF\n", tbf->tfi);
break;
case CCCH_ESTABLISH:
// Downlink TBF Establishment on CCCH ( Immediate Assignment )
tbf_gsm_timer_start(tbf, 1, 0);
break;
case PACCH_ESTABLISH:
// Downlink TBF Establishment on PACCH ( Packet Immediate Assignment )
gprs_rlcmac_packet_downlink_assignment(tbf);
tbf->state = FINISH_ESTABLISH;
break;
default:
LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [DOWNLINK] TFI: %u Unexpected TBF state = %u for stage = %u \n",
tbf->tfi, tbf->state, tbf->stage);
break;
}
}
return 1;
}
/* Management of uplink TBF data transfer. */
int tbf_ul_data_transfer(struct gprs_rlcmac_tbf *tbf, RlcMacUplinkDataBlock_t * ul_data_block)
{
if ((tbf->stage == TBF_RELEASE)||(tbf->direction != GPRS_RLCMAC_UL_TBF))
{
return -1;
}
if (tbf->stage == TBF_ESTABLISH)
{
tbf->stage = TBF_DATA_TRANSFER;
tbf->state = WAIT_DATA_TRANSFER;
}
if (ul_data_block->TI == 1)
{
tbf->tlli = ul_data_block->TLLI;
// TODO: Kill all other UL TBFs with this TLLI.
}
switch (tbf->state) {
case WAIT_DATA_TRANSFER:
if (ul_data_block->BSN == 0)
{
tbf->data_index = 0;
gprs_rlcmac_data_block_parse(tbf, ul_data_block);
gprs_rlcmac_tx_ul_ack(tbf->tfi, tbf->tlli, ul_data_block->CV ? 0: 1, ul_data_block->BSN);
if (ul_data_block->CV == 0)
{
// Recieved last Data Block in this sequence.
tbf->state = FINISH_DATA_TRANSFER;
gprs_rlcmac_tx_ul_ud(tbf);
}
else
{
tbf->bsn = ul_data_block->BSN;
tbf->state = DATA_TRANSFER;
}
}
break;
case DATA_TRANSFER:
if (tbf->bsn == (ul_data_block->BSN - 1))
{
gprs_rlcmac_data_block_parse(tbf, ul_data_block);
if (ul_data_block->CV == 0)
{
gprs_rlcmac_tx_ul_ack(tbf->tfi, tbf->tlli, 1, ul_data_block->BSN);
// Recieved last Data Block in this sequence.
tbf->state = FINISH_DATA_TRANSFER;
gprs_rlcmac_tx_ul_ud(tbf);
}
else
{
tbf->bsn = ul_data_block->BSN;
}
}
break;
case FINISH_DATA_TRANSFER:
// Now we just ignore all Data Blocks and wait release of TBF.
break;
default:
LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [UPLINK] TFI: %u Unexpected TBF state = %u for stage = %u \n",
tbf->tfi, tbf->state, tbf->stage);
break;
}
if ((tbf->state == FINISH_DATA_TRANSFER) && (tbf->next_tbf))
{
// Establish DL TBF, if it is required.
if ((tbf->next_tbf)->state == WAIT_ESTABLISH)
{
(tbf->next_tbf)->state = PACCH_ESTABLISH;
tbf_dl_establish(tbf->next_tbf);
}
}
return 1;
}
/* Management of downlink TBF data transfer. */
int tbf_dl_data_transfer(struct gprs_rlcmac_tbf *tbf, uint8_t *llc_pdu, uint16_t llc_pdu_len)
{
if ((tbf->stage == TBF_RELEASE) || (tbf->direction != GPRS_RLCMAC_DL_TBF))
{
return -1;
}
if (llc_pdu_len > 0)
{
tbf_add_llc_pdu(tbf, llc_pdu, llc_pdu_len);
}
if (tbf->stage == TBF_ESTABLISH)
{
if (tbf->state == FINISH_ESTABLISH)
{
tbf->stage = TBF_DATA_TRANSFER;
tbf->state = DATA_TRANSFER;
}
}
if (tbf->stage == TBF_DATA_TRANSFER)
{
switch (tbf->state) {
case DATA_TRANSFER:
gprs_rlcmac_tx_llc_pdus(tbf);
tbf->state = FINISH_DATA_TRANSFER;
break;
default:
LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [DOWNLINK] TFI: %u Unexpected TBF state = %u for stage = %u \n",
tbf->tfi, tbf->state, tbf->stage);
break;
}
}
return 1;
}
/* Management of uplink TBF release. */
int tbf_ul_release(struct gprs_rlcmac_tbf *tbf)
{
if (tbf->direction != GPRS_RLCMAC_UL_TBF)
{
return -1;
}
if (tbf->next_tbf)
{
// UL TBF data transfer is finished, start DL TBF data transfer.
tbf_dl_data_transfer(tbf->next_tbf);
}
tbf->stage = TBF_RELEASE;
tbf->state = RELEASE;
LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [UPLINK] END TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli);
tbf_free(tbf);
return 1;
}
/* Management of downlink TBF release. */
int tbf_dl_release(struct gprs_rlcmac_tbf *tbf)
{
if (tbf->direction != GPRS_RLCMAC_DL_TBF)
{
return -1;
}
tbf->stage = TBF_RELEASE;
tbf->state = RELEASE;
LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [DOWNLINK] END TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli);
tbf_free(tbf);
return 1;
}
static void tbf_timer_cb(void *_tbf)
{
struct gprs_rlcmac_tbf *tbf = (struct gprs_rlcmac_tbf *)_tbf;
tbf->num_T_exp++;
switch (tbf->T) {
case 1111:
// TODO: We should add timers for TBF.
break;
default:
LOGP(DRLCMAC, LOGL_NOTICE, "Timer expired in unknown mode: %u \n", tbf->T);
}
}
static void tbf_timer_start(struct gprs_rlcmac_tbf *tbf, unsigned int T,
unsigned int seconds)
{
if (osmo_timer_pending(&tbf->timer))
LOGP(DRLCMAC, LOGL_NOTICE, "Starting TBF timer %u while old timer %u pending \n", T, tbf->T);
tbf->T = T;
tbf->num_T_exp = 0;
/* FIXME: we should do this only once ? */
tbf->timer.data = tbf;
tbf->timer.cb = &tbf_timer_cb;
osmo_timer_schedule(&tbf->timer, seconds, 0);
}
static void tbf_gsm_timer_cb(void *_tbf)
{
struct gprs_rlcmac_tbf *tbf = (struct gprs_rlcmac_tbf *)_tbf;
tbf->num_fT_exp++;
switch (tbf->fT) {
case 1:
if (tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_UL_TBF))
{
// Wait release of UL TBF
tbf_gsm_timer_start(tbf, 1, 10);
}
else
{
gprs_rlcmac_downlink_assignment(tbf);
// FIXME: Remove magic delay!
int delay = 50;
tbf_gsm_timer_start(tbf, 2, delay);
}
break;
case 2:
tbf->state = FINISH_ESTABLISH;
tbf_dl_data_transfer(tbf);
break;
default:
LOGP(DRLCMAC, LOGL_NOTICE, "Timer expired in unknown mode: %u \n", tbf->fT);
}
}
static void tbf_gsm_timer_start(struct gprs_rlcmac_tbf *tbf, unsigned int fT,
int frames)
{
if (osmo_gsm_timer_pending(&tbf->gsm_timer))
LOGP(DRLCMAC, LOGL_NOTICE, "Starting TBF timer %u while old timer %u pending \n", fT, tbf->fT);
tbf->fT = fT;
tbf->num_fT_exp = 0;
/* FIXME: we should do this only once ? */
tbf->gsm_timer.data = tbf;
tbf->gsm_timer.cb = &tbf_gsm_timer_cb;
osmo_gsm_timer_schedule(&tbf->gsm_timer, frames);
}
static void gprs_rlcmac_enqueue_block(bitvec *block, int len)
{
struct msgb *msg = msgb_alloc(len, "rlcmac_dl");
bitvec_pack(block, msgb_put(msg, len));
msgb_enqueue(&block_queue, msg);
}
void write_packet_downlink_assignment(RlcMacDownlink_t * block, uint8_t tfi, uint16_t arfcn, uint8_t tn, uint8_t ta, uint8_t tsc)
{
// Packet downlink assignment TS 44.060 11.2.7
int i;
block->PAYLOAD_TYPE = 0x1; // RLC/MAC control block that does not include the optional octets of the RLC/MAC control header
block->RRBP = 0x0; // N+13
block->SP = 0x1; // RRBP field is valid
block->USF = 0x1; // Uplink state flag
block->u.Packet_Downlink_Assignment.MESSAGE_TYPE = 0x2; // Packet Downlink Assignment
block->u.Packet_Downlink_Assignment.PAGE_MODE = 0x0; // Normal Paging
block->u.Packet_Downlink_Assignment.Exist_PERSISTENCE_LEVEL = 0x0; // PERSISTENCE_LEVEL: off
block->u.Packet_Downlink_Assignment.ID.UnionType = 0x0; // TFI = on
block->u.Packet_Downlink_Assignment.ID.u.Global_TFI.UnionType = 0x0; // UPLINK TFI = on
block->u.Packet_Downlink_Assignment.ID.u.Global_TFI.u.UPLINK_TFI = tfi-1; // TFI
block->u.Packet_Downlink_Assignment.MAC_MODE = 0x0; // Dynamic Allocation
block->u.Packet_Downlink_Assignment.RLC_MODE = 0x0; // RLC acknowledged mode
block->u.Packet_Downlink_Assignment.CONTROL_ACK = 0x0; // NW establishes no new DL TBF for the MS with running timer T3192
block->u.Packet_Downlink_Assignment.TIMESLOT_ALLOCATION = 0x80 >> tn; // timeslot(s)
block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.Exist_TIMING_ADVANCE_VALUE = 0x1; // TIMING_ADVANCE_VALUE = on
block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.TIMING_ADVANCE_VALUE = ta; // TIMING_ADVANCE_VALUE
block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.Exist_IndexAndtimeSlot = 0x0; // TIMING_ADVANCE_INDEX = off
block->u.Packet_Downlink_Assignment.Exist_P0_and_BTS_PWR_CTRL_MODE = 0x0; // POWER CONTROL = off
block->u.Packet_Downlink_Assignment.Exist_Frequency_Parameters = 0x1; // Frequency Parameters = on
block->u.Packet_Downlink_Assignment.Frequency_Parameters.TSC = tsc; // Training Sequence Code (TSC)
block->u.Packet_Downlink_Assignment.Frequency_Parameters.UnionType = 0x0; // ARFCN = on
block->u.Packet_Downlink_Assignment.Frequency_Parameters.u.ARFCN = arfcn; // ARFCN
block->u.Packet_Downlink_Assignment.Exist_DOWNLINK_TFI_ASSIGNMENT = 0x1; // DOWNLINK TFI ASSIGNMENT = on
block->u.Packet_Downlink_Assignment.DOWNLINK_TFI_ASSIGNMENT = tfi; // TFI
block->u.Packet_Downlink_Assignment.Exist_Power_Control_Parameters = 0x1; // Power Control Parameters = on
block->u.Packet_Downlink_Assignment.Power_Control_Parameters.ALPHA = 0x0; // ALPHA
for (i = 0; i < 8; i++)
{
if (tn == i)
{
block->u.Packet_Downlink_Assignment.Power_Control_Parameters.Slot[i].Exist = 0x1; // Slot[i] = on
block->u.Packet_Downlink_Assignment.Power_Control_Parameters.Slot[i].GAMMA_TN = 0x0; // GAMMA_TN
}
else
{
block->u.Packet_Downlink_Assignment.Power_Control_Parameters.Slot[i].Exist = 0x0; // Slot[i] = off
}
}
block->u.Packet_Downlink_Assignment.Exist_TBF_Starting_Time = 0x0; // TBF Starting TIME = off
block->u.Packet_Downlink_Assignment.Exist_Measurement_Mapping = 0x0; // Measurement_Mapping = off
block->u.Packet_Downlink_Assignment.Exist_AdditionsR99 = 0x0; // AdditionsR99 = off
}
// GSM 04.08 9.1.18 Immediate assignment
int write_immediate_assignment(bitvec * dest, uint8_t downlink, uint8_t ra, uint32_t fn,
uint8_t ta, uint16_t arfcn, uint8_t ts, uint8_t tsc, uint8_t tfi, uint32_t tlli)
{
unsigned wp = 0;
bitvec_write_field(dest, wp,0x0,4); // Skip Indicator
bitvec_write_field(dest, wp,0x6,4); // Protocol Discriminator
bitvec_write_field(dest, wp,0x3F,8); // Immediate Assignment Message Type
// 10.5.2.25b Dedicated mode or TBF
bitvec_write_field(dest, wp,0x0,1); // spare
bitvec_write_field(dest, wp,0x0,1); // TMA : Two-message assignment: No meaning
bitvec_write_field(dest, wp,downlink,1); // Downlink : Downlink assignment to mobile in packet idle mode
bitvec_write_field(dest, wp,0x1,1); // T/D : TBF or dedicated mode: this message assigns a Temporary Block Flow (TBF).
bitvec_write_field(dest, wp,0x0,4); // Page Mode
// GSM 04.08 10.5.2.25a Packet Channel Description
bitvec_write_field(dest, wp,0x1,5); // Channel type
bitvec_write_field(dest, wp,ts,3); // TN
bitvec_write_field(dest, wp,tsc,3); // TSC
bitvec_write_field(dest, wp,0x0,3); // non-hopping RF channel configuraion
bitvec_write_field(dest, wp,arfcn,10); // ARFCN
//10.5.2.30 Request Reference
bitvec_write_field(dest, wp,ra,8); // RA
bitvec_write_field(dest, wp,(fn / (26 * 51)) % 32,5); // T1'
bitvec_write_field(dest, wp,fn % 51,6); // T3
bitvec_write_field(dest, wp,fn % 26,5); // T2
// 10.5.2.40 Timing Advance
bitvec_write_field(dest, wp,0x0,2); // spare
bitvec_write_field(dest, wp,ta,6); // Timing Advance value
// No mobile allocation in non-hopping systems.
// A zero-length LV. Just write L=0.
bitvec_write_field(dest, wp,0,8);
if (downlink)
{
// GSM 04.08 10.5.2.16 IA Rest Octets
bitvec_write_field(dest, wp, 3, 2); // "HH"
bitvec_write_field(dest, wp, 1, 2); // "01" Packet Downlink Assignment
bitvec_write_field(dest, wp,tlli,32); // TLLI
bitvec_write_field(dest, wp,0x1,1); // switch TFI : on
bitvec_write_field(dest, wp,tfi,5); // TFI
bitvec_write_field(dest, wp,0x0,1); // RLC acknowledged mode
bitvec_write_field(dest, wp,0x0,1); // ALPHA = present
bitvec_write_field(dest, wp,0x0,5); // GAMMA power control parameter
bitvec_write_field(dest, wp,0x0,1); // Polling Bit
bitvec_write_field(dest, wp,0x1,1); // TA_VALID ???
bitvec_write_field(dest, wp,0x1,1); // switch TIMING_ADVANCE_INDEX = on
bitvec_write_field(dest, wp,0x0,4); // TIMING_ADVANCE_INDEX
bitvec_write_field(dest, wp,0x0,1); // TBF Starting TIME present
bitvec_write_field(dest, wp,0x0,1); // P0 not present
bitvec_write_field(dest, wp,0x1,1); // P0 not present
bitvec_write_field(dest, wp,0xb,4);
}
else
{
// GMS 04.08 10.5.2.37b 10.5.2.16
bitvec_write_field(dest, wp, 3, 2); // "HH"
bitvec_write_field(dest, wp, 0, 2); // "0" Packet Uplink Assignment
bitvec_write_field(dest, wp, 1, 1); // Block Allocation : Not Single Block Allocation
bitvec_write_field(dest, wp, tfi, 5); // TFI_ASSIGNMENT Temporary Flow Identity
bitvec_write_field(dest, wp, 0, 1); // POLLING
bitvec_write_field(dest, wp, 0, 1); // ALLOCATION_TYPE: dynamic
bitvec_write_field(dest, wp, 1, 3); // USF
bitvec_write_field(dest, wp, 0, 1); // USF_GRANULARITY
bitvec_write_field(dest, wp, 0 , 1); // "0" power control: Not Present
bitvec_write_field(dest, wp, 0, 2); // CHANNEL_CODING_COMMAND
bitvec_write_field(dest, wp, 0, 1); // TLLI_BLOCK_CHANNEL_CODING
bitvec_write_field(dest, wp, 1 , 1); // "1" Alpha : Present
bitvec_write_field(dest, wp, 0, 4); // Alpha
bitvec_write_field(dest, wp, 0, 5); // Gamma
bitvec_write_field(dest, wp, 0, 1); // TIMING_ADVANCE_INDEX_FLAG
bitvec_write_field(dest, wp, 0, 1); // TBF_STARTING_TIME_FLAG
}
if (wp%8)
return wp/8+1;
else
return wp/8;
}
int write_paging_request(bitvec * dest, uint8_t *ptmsi, uint16_t ptmsi_len)
{
unsigned wp = 0;
bitvec_write_field(dest, wp,0x0,4); // Skip Indicator
bitvec_write_field(dest, wp,0x6,4); // Protocol Discriminator
bitvec_write_field(dest, wp,0x21,8); // Paging Request Message Type
bitvec_write_field(dest, wp,0x0,4); // Page Mode
bitvec_write_field(dest, wp,0x0,4); // Channel Needed
// Mobile Identity
bitvec_write_field(dest, wp,ptmsi_len+1,8); // Mobile Identity length
bitvec_write_field(dest, wp,0xf,4); // unused
bitvec_write_field(dest, wp,0x4,4); // PTMSI type
for (int i = 0; i < ptmsi_len; i++)
{
bitvec_write_field(dest, wp,ptmsi[i],8); // PTMSI
}
bitvec_write_field(dest, wp,0x0,1); // "L" NLN(PCH) = off
bitvec_write_field(dest, wp,0x0,1); // "L" Priority1 = off
bitvec_write_field(dest, wp,0x1,1); // "L" Priority2 = off
bitvec_write_field(dest, wp,0x0,1); // "L" Group Call information = off
bitvec_write_field(dest, wp,0x0,1); // "H" Packet Page Indication 1 = packet paging procedure
bitvec_write_field(dest, wp,0x1,1); // "H" Packet Page Indication 2 = packet paging procedure
bitvec_write_field(dest, wp,0x3,2); // spare padding
return wp/8;
}
void write_packet_uplink_ack(RlcMacDownlink_t * block, uint8_t tfi, uint32_t tlli, uint8_t fi, uint8_t bsn)
{
// Packet Uplink Ack/Nack TS 44.060 11.2.28
int i;
block->PAYLOAD_TYPE = 0x1; // RLC/MAC control block that does not include the optional octets of the RLC/MAC control header
block->RRBP = 0x0; // N+13
block->SP = fi; // RRBP field is valid, if it is final ack
block->USF = 0x1; // Uplink state flag
block->u.Packet_Uplink_Ack_Nack.MESSAGE_TYPE = 0x9; // Packet Downlink Assignment
block->u.Packet_Uplink_Ack_Nack.PAGE_MODE = 0x0; // Normal Paging
block->u.Packet_Uplink_Ack_Nack.UPLINK_TFI = tfi; // Uplink TFI
block->u.Packet_Uplink_Ack_Nack.UnionType = 0x0; // PU_AckNack_GPRS = on
block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.CHANNEL_CODING_COMMAND = 0x0; // CS1
block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Ack_Nack_Description.FINAL_ACK_INDICATION = fi; // FINAL ACK INDICATION
block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Ack_Nack_Description.STARTING_SEQUENCE_NUMBER = bsn + 1; // STARTING SEQUENCE NUMBER
for (i = 0; i < 8; i++)
{
block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Ack_Nack_Description.RECEIVED_BLOCK_BITMAP[i] = 0xff; // RECEIVED BLOCK BITMAP
}
block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.UnionType = 0x0; // Fixed Allocation Dummy = on
block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.u.FixedAllocationDummy = 0x0; // Fixed Allocation Dummy
block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Exist_AdditionsR99 = 0x0; // AdditionsR99 = off
block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.Exist_CONTENTION_RESOLUTION_TLLI = 0x1;
block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.CONTENTION_RESOLUTION_TLLI = tlli;
block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.Exist_Packet_Timing_Advance = 0x0;
block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.Exist_Extension_Bits = 0x0;
block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.Exist_Power_Control_Parameters = 0x0;
}
void gprs_rlcmac_tx_ul_ack(uint8_t tfi, uint32_t tlli, uint8_t fi, uint8_t bsn)
{
bitvec *packet_uplink_ack_vec = bitvec_alloc(23);
bitvec_unhex(packet_uplink_ack_vec, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
RlcMacDownlink_t * packet_uplink_ack = (RlcMacDownlink_t *)malloc(sizeof(RlcMacDownlink_t));
write_packet_uplink_ack(packet_uplink_ack, tfi, tlli, fi, bsn);
LOGP(DRLCMAC, LOGL_NOTICE, "TX: [PCU -> BTS] TFI: %u TLLI: 0x%08x Packet Uplink Ack\n", tfi, tlli);
LOGP(DRLCMAC, LOGL_NOTICE, "+++++++++++++++++++++++++ TX : Packet Uplink Ack +++++++++++++++++++++++++\n");
encode_gsm_rlcmac_downlink(packet_uplink_ack_vec, packet_uplink_ack);
LOGPC(DRLCMAC, LOGL_NOTICE, "\n");
LOGP(DRLCMAC, LOGL_NOTICE, "------------------------- TX : Packet Uplink Ack -------------------------\n");
free(packet_uplink_ack);
gprs_rlcmac_enqueue_block(packet_uplink_ack_vec, 23);
bitvec_free(packet_uplink_ack_vec);
}
void gprs_rlcmac_data_block_parse(gprs_rlcmac_tbf* tbf, RlcMacUplinkDataBlock_t * ul_data_block)
{
// 1. Count the number of octets in header and number of LLC PDU in uplink data block.
unsigned data_block_hdr_len = 3; // uplink data block header length: 3 mandatory octets
unsigned llc_pdu_num = 0; // number of LLC PDU in data block
if (ul_data_block->E_1 == 0) // Extension octet follows immediately
{
unsigned i = -1;
do
{
i++;
data_block_hdr_len += 1;
llc_pdu_num++;
// Singular case, TS 44.060 10.4.14
if (ul_data_block->LENGTH_INDICATOR[i] == 0)
{
break;
}
// New LLC PDU starts after the current LLC PDU and continues until
// the end of the RLC information field, no more extension octets.
if ((ul_data_block->M[i] == 1)&&(ul_data_block->E[i] == 1))
{
llc_pdu_num++;
}
} while(ul_data_block->E[i] == 0); // there is another extension octet, which delimits the new LLC PDU
}
else
{
llc_pdu_num++;
}
if(ul_data_block->TI == 1) // TLLI field is present
{
tbf->tlli = ul_data_block->TLLI;
data_block_hdr_len += 4; // TLLI length : 4 octets
if (ul_data_block->PI == 1) // PFI is present if TI field indicates presence of TLLI
{
data_block_hdr_len += 1; // PFI length : 1 octet
}
}
// 2. Extract all LLC PDU from uplink data block and send them to SGSN.
unsigned llc_pdu_len = 0;
unsigned data_octet_num = 0;
for (unsigned num = 0; num < llc_pdu_num; num ++)
{
if (ul_data_block->E_1 == 0) // Extension octet follows immediately
{
// Singular case, TS 44.060 10.4.14
if (ul_data_block->LENGTH_INDICATOR[num] == 0)
{
llc_pdu_len = UL_RLC_DATA_BLOCK_LEN - data_block_hdr_len;
}
else
{
llc_pdu_len = ul_data_block->LENGTH_INDICATOR[num];
}
}
else
{
llc_pdu_len = UL_RLC_DATA_BLOCK_LEN - data_block_hdr_len;
}
for (unsigned i = tbf->data_index; i < tbf->data_index + llc_pdu_len; i++)
{
tbf->rlc_data[i] = ul_data_block->RLC_DATA[data_octet_num];
data_octet_num++;
}
tbf->data_index += llc_pdu_len;
if (ul_data_block->E_1 == 0) // Extension octet follows immediately
{
// New LLC PDU starts after the current LLC PDU
if (ul_data_block->M[num] == 1)
{
gprs_rlcmac_tx_ul_ud(tbf);
tbf->data_index = 0;
// New LLC PDU continues until the end of the RLC information field, no more extension octets.
if ((ul_data_block->E[num] == 1))
{
llc_pdu_len = UL_RLC_DATA_BLOCK_LEN - data_block_hdr_len - data_octet_num;
for (unsigned i = tbf->data_index; i < tbf->data_index + llc_pdu_len; i++)
{
tbf->rlc_data[i] = ul_data_block->RLC_DATA[data_octet_num];
data_octet_num++;
}
tbf->data_index += llc_pdu_len;
num++;
}
}
}
}
}
/* Received Uplink RLC data block. */
int gprs_rlcmac_rcv_data_block(bitvec *rlc_block)
{
struct gprs_rlcmac_tbf *tbf;
int rc = 0;
LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] Uplink Data Block\n");
RlcMacUplinkDataBlock_t * ul_data_block = (RlcMacUplinkDataBlock_t *)malloc(sizeof(RlcMacUplinkDataBlock_t));
LOGP(DRLCMAC, LOGL_NOTICE, "+++++++++++++++++++++++++ RX : Uplink Data Block +++++++++++++++++++++++++\n");
decode_gsm_rlcmac_uplink_data(rlc_block, ul_data_block);
LOGP(DRLCMAC, LOGL_NOTICE, "------------------------- RX : Uplink Data Block -------------------------\n");
tbf = tbf_by_tfi(ul_data_block->TFI, GPRS_RLCMAC_UL_TBF);
if (!tbf) {
return -1;
}
rc = tbf_ul_data_transfer(tbf, ul_data_block);
free(ul_data_block);
return rc;
}
/* Received Uplink RLC control block. */
int gprs_rlcmac_rcv_control_block(bitvec *rlc_block)
{
uint8_t tfi = 0;
uint32_t tlli = 0;
struct gprs_rlcmac_tbf *tbf;
RlcMacUplink_t * ul_control_block = (RlcMacUplink_t *)malloc(sizeof(RlcMacUplink_t));
LOGP(DRLCMAC, LOGL_NOTICE, "+++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++\n");
decode_gsm_rlcmac_uplink(rlc_block, ul_control_block);
LOGPC(DRLCMAC, LOGL_NOTICE, "\n");
LOGP(DRLCMAC, LOGL_NOTICE, "------------------------- RX : Uplink Control Block -------------------------\n");
switch (ul_control_block->u.MESSAGE_TYPE) {
case MT_PACKET_CONTROL_ACK:
tlli = ul_control_block->u.Packet_Control_Acknowledgement.TLLI;
tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_UL_TBF);
if (!tbf) {
return 0;
}
LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet Control Ack\n", tbf->tfi, tbf->tlli);
tbf_ul_release(tbf);
break;
case MT_PACKET_DOWNLINK_ACK_NACK:
tfi = ul_control_block->u.Packet_Downlink_Ack_Nack.DOWNLINK_TFI;
tbf = tbf_by_tfi(tfi, GPRS_RLCMAC_DL_TBF);
if (!tbf) {
return 0;
}
LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet Downlink Ack/Nack\n", tbf->tfi, tbf->tlli);
tbf_dl_release(tbf);
break;
}
free(ul_control_block);
return 1;
}
void gprs_rlcmac_rcv_block(bitvec *rlc_block)
{
unsigned readIndex = 0;
unsigned payload = bitvec_read_field(rlc_block, readIndex, 2);
switch (payload) {
case GPRS_RLCMAC_DATA_BLOCK:
gprs_rlcmac_rcv_data_block(rlc_block);
break;
case GPRS_RLCMAC_CONTROL_BLOCK:
gprs_rlcmac_rcv_control_block(rlc_block);
break;
case GPRS_RLCMAC_CONTROL_BLOCK_OPT:
LOGP(DRLCMAC, LOGL_NOTICE, "GPRS_RLCMAC_CONTROL_BLOCK_OPT block payload is not supported.\n");
default:
LOGP(DRLCMAC, LOGL_NOTICE, "Unknown RLCMAC block payload.\n");
}
}
struct msgb *gen_dummy_msg(uint8_t usf)
{
struct msgb *msg = msgb_alloc(23, "rlcmac_dl_idle");
// RLC/MAC filler with USF=1
bitvec *filler = bitvec_alloc(23);
#warning HACK
if (usf == 1)
bitvec_unhex(filler, "41942b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
else
bitvec_unhex(filler, "42942b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
bitvec_pack(filler, msgb_put(msg, 23));
bitvec_free(filler);
return msg;
}
void gprs_rlcmac_rcv_rts_block(uint8_t trx, uint8_t ts, uint16_t arfcn,
uint32_t fn, uint8_t block_nr)
{
struct msgb *msg;
set_current_fn(fn);
msg = msgb_dequeue(&block_queue);
if (!msg)
msg = gen_dummy_msg(block_nr ? 2 : 1);
pcu_l1if_tx_pdtch(msg, trx, ts, arfcn, fn, block_nr);
}
int select_pdch(uint8_t *_trx, uint8_t *_ts)
{
uint8_t trx, ts;
for (trx = 0; trx < 8; trx++) {
for (ts = 0; ts < 8; ts++) {
if (pcu_l1if_bts.trx[trx].ts[ts].enable) {
*_trx = trx;
*_ts = ts;
return 0;
}
}
}
return -EBUSY;
}
int gprs_rlcmac_rcv_rach(uint8_t ra, uint32_t Fn, int16_t qta)
{
struct gprs_rlcmac_tbf *tbf;
uint8_t trx, ts;
static uint8_t prev_ra = 0;
if (prev_ra == ra)
{
return -1;
}
tbf = tbf_alloc(GPRS_RLCMAC_UL_TBF);
return tbf_ul_establish(tbf, ra, Fn, qta);
}
int gprs_rlcmac_tx_llc_pdus(struct gprs_rlcmac_tbf *tbf)
{
int fbi = 0;
int bsn = 0;
if (tbf->llc_pdu_list_len == 0)
{
return -1;
}
bitvec *data_block_vector = bitvec_alloc(BLOCK_LEN);
bitvec_unhex(data_block_vector, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
RlcMacDownlinkDataBlock_t * data_block = (RlcMacDownlinkDataBlock_t *)malloc(sizeof(RlcMacDownlinkDataBlock_t));
struct tbf_llc_pdu *llc_pdu;
int data_block_ready = 0;
unsigned data_oct_num = 0;
int llc_pdu_index;
for (unsigned i = 0; i < tbf->llc_pdu_list_len; i++)
{
llc_pdu = tbf_llc_pdu_by_num(tbf->llc_pdus, i);
if (!llc_pdu)
{
return -1;
}
llc_pdu_index = 0;
do
{
data_block->PAYLOAD_TYPE = 0;
data_block->RRBP = 0;
data_block->SP = 1;
data_block->USF = 1;
data_block->PR = 0;
data_block->TFI = tbf->tfi;
data_block->BSN = bsn;
// Write LLC PDU to Data Block
int j;
for(j = llc_pdu_index; j < llc_pdu->len; j++)
{
data_block->RLC_DATA[data_oct_num] = llc_pdu->data[j];
data_oct_num++;
llc_pdu_index++;
// RLC data field is completely filled.
if (data_oct_num == BLOCK_LEN - 3)
{
fbi = 0;
data_block->E_1 = 1;
data_block_ready = 1;
break;
}
}
if(!data_block_ready)
{
data_block->E_1 = 0;
data_block->LENGTH_INDICATOR[0] = data_oct_num;
if ((i+1) == tbf->llc_pdu_list_len)
{
// Current LLC PDU is last in TBF.
data_block->M[0] = 0;
data_block->E[0] = 1;
fbi = 1;
for(unsigned k = data_oct_num; k < BLOCK_LEN - 4; k++)
{
data_block->RLC_DATA[k] = 0x2b;
}
data_block_ready = 1;
}
else
{
// More LLC PDUs should be transmited in this TBF.
data_block->M[0] = 1;
data_block->E[0] = 1;
data_block_ready = 1;
break;
}
}
data_block->FBI = fbi;
if(data_block_ready)
{
LOGP(DRLCMAC, LOGL_NOTICE, "TX: [PCU -> BTS] Downlink Data Block\n");
LOGP(DRLCMAC, LOGL_NOTICE, "+++++++++++++++++++++++++ TX : Downlink Data Block +++++++++++++++++++++++++\n");
encode_gsm_rlcmac_downlink_data(data_block_vector, data_block);
LOGP(DRLCMAC, LOGL_NOTICE, "------------------------- TX : Downlink Data Block -------------------------\n");
gprs_rlcmac_enqueue_block(data_block_vector, BLOCK_LEN);
bitvec_unhex(data_block_vector, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
bsn++;
data_block_ready = 0;
data_oct_num = 0;
}
}
while(llc_pdu->len != llc_pdu_index);
}
return 0;
}
/* Send Uplink unit-data to SGSN. */
void gprs_rlcmac_tx_ul_ud(gprs_rlcmac_tbf *tbf)
{
const uint8_t qos_profile = QOS_PROFILE;
struct msgb *llc_pdu;
unsigned msg_len = NS_HDR_LEN + BSSGP_HDR_LEN + tbf->data_index;
LOGP(DBSSGP, LOGL_NOTICE, "TX: [PCU -> SGSN ] TFI: %u TLLI: 0x%08x DataLen: %u", tbf->tfi, tbf->tlli, tbf->data_index);
//LOGP(DBSSGP, LOGL_NOTICE, " Data = ");
//for (unsigned i = 0; i < tbf->data_index; i++)
// LOGPC(DBSSGP, LOGL_NOTICE, "%02x ", tbf->rlc_data[i]);
bctx->cell_id = CELL_ID;
bctx->nsei = NSEI;
bctx->ra_id.mnc = MNC;
bctx->ra_id.mcc = MCC;
bctx->ra_id.lac = PCU_LAC;
bctx->ra_id.rac = PCU_RAC;
bctx->bvci = BVCI;
llc_pdu = msgb_alloc_headroom(msg_len, msg_len,"llc_pdu");
msgb_tvlv_push(llc_pdu, BSSGP_IE_LLC_PDU, sizeof(uint8_t)*tbf->data_index, tbf->rlc_data);
bssgp_tx_ul_ud(bctx, tbf->tlli, &qos_profile, llc_pdu);
}
void gprs_rlcmac_downlink_assignment(gprs_rlcmac_tbf *tbf)
{
LOGP(DRLCMAC, LOGL_NOTICE, "TX: [PCU -> BTS] TFI: %u TLLI: 0x%08x Immidiate Assignment (CCCH)\n", tbf->tfi, tbf->tlli);
bitvec *immediate_assignment = bitvec_alloc(23);
bitvec_unhex(immediate_assignment, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
int len = write_immediate_assignment(immediate_assignment, 1, 125, get_current_fn(), tbf->ta, tbf->arfcn, tbf->ts, tbf->tsc, tbf->tfi, tbf->tlli);
pcu_l1if_tx_agch(immediate_assignment, len);
bitvec_free(immediate_assignment);
}
void gprs_rlcmac_packet_downlink_assignment(gprs_rlcmac_tbf *tbf)
{
LOGP(DRLCMAC, LOGL_NOTICE, "TX: [PCU -> BTS] TFI: %u TLLI: 0x%08x Packet DL Assignment\n", tbf->tfi, tbf->tlli);
bitvec *packet_downlink_assignment_vec = bitvec_alloc(23);
bitvec_unhex(packet_downlink_assignment_vec, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
RlcMacDownlink_t * packet_downlink_assignment = (RlcMacDownlink_t *)malloc(sizeof(RlcMacDownlink_t));
write_packet_downlink_assignment(packet_downlink_assignment, tbf->tfi, tbf->arfcn, tbf->ts, tbf->ta, tbf->tsc);
LOGP(DRLCMAC, LOGL_NOTICE, "+++++++++++++++++++++++++ TX : Packet Downlink Assignment +++++++++++++++++++++++++\n");
encode_gsm_rlcmac_downlink(packet_downlink_assignment_vec, packet_downlink_assignment);
LOGPC(DRLCMAC, LOGL_NOTICE, "\n");
LOGP(DRLCMAC, LOGL_NOTICE, "------------------------- TX : Packet Downlink Assignment -------------------------\n");
free(packet_downlink_assignment);
gprs_rlcmac_enqueue_block(packet_downlink_assignment_vec, 23);
bitvec_free(packet_downlink_assignment_vec);
}
void gprs_rlcmac_paging_request(uint8_t *ptmsi, uint16_t ptmsi_len)
{
LOGP(DRLCMAC, LOGL_NOTICE, "TX: [PCU -> BTS] Paging Request (CCCH)\n");
bitvec *paging_request = bitvec_alloc(23);
bitvec_unhex(paging_request, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
int len = write_paging_request(paging_request, ptmsi, ptmsi_len);
pcu_l1if_tx_pch(paging_request, len);
bitvec_free(paging_request);
}
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